I want a drama were a new man fight for the female lead with the ex-husband and ultimately wins like in 

Twenty Again (fav)

Queen of reversals (fav)

The Good Wife (fav)

Ms. Perfect

Fierce wife

My sunshine

Try Another Miss Oh. Ex-boyfriend breaks up with female lead short time before wedding and she meets the new guy. Later the ex-bf comes back briefly. It is not however the main plot of the drama. (The synopsis and trailer on the drama here on mdl and basically everywhere else is kinda misleading though, i suggest to you to try the first episode and then decide :))

I have already watched another miss oh.

And I'm looking for Ex-husband vs new man. I don't like Ex-boyfriend vs new man that much.

Thanks for the suggestion. Anymore will be helpful.